Improvement in door-latches



DOOR-LATCH.

Patented Feb. 27 1877.

.IN N BR:

a W 5 5 V M M W .PETERS PNOTWUTHOGRAPHER. W

UNITED S ATES PATENT QFFICE.

WILLIAM A. BARLOW, OF CHICAGO, ILLINOIS.

IMPROVEMENT IN DOOR-LATCHES.

Specification forming part of Letters Patent No. 187,698, dated February27, 1877; application filed August 3,1876.

To all whom it may concern:

Be it known that I, WILLIAM A. BARLOW, of Chicago, in the county of Cookand State of Illinois, have invented certain new and useful Improvementsin Combined Door Locks and Latches; and I do hereby declare thefollowing to be a full, clear, and exact description thereof, which willenable others skilled in the art to which it appertains to make and usethe same, reference being had to the accomver, whereby the latch isactuated'by a movement of the knob in either direction, as will be morefully understood from the following description. p

In the drawing, A represents the lock-case, which may be made in theform shown, or in any other suitable form that will receive theoperating parts; B, the lock-bolt; O, the tumbler bar, and D theadjustingspring, all of which constitute no part of my said invention. 4

E is the latch-bolt, which passes through a mortise in the edge of thecase, in the usual manner. F is the latch-lever, fulcrumed at its upperend to, the wall of the case, and hinged at its lower end to the innerend of the latch, as shown, and is so arranged as to admit of an easyvibratory movement. This lever F is made in the form approximating theletter S, and its upper wing or short arm beveled to an angle of aboutforty-five degrees to the plane of the edge of the case, as shown at d,Fig. 1. I

O is a stop-pin secured to the wall of the case, and against which thelatch-lever rests when not acted upon by the hub. The latchlever isprovided on its side, near its front edge, a short distance below itsfulcrum, with a lug, e,'adapted to receive the end of spring D, by whichmeans the latch is forced outward to the position shown in Fig. 1.

H is an intermediate lever,fu1crnmed at one end to the walls of thecase, and so arranged as to admit of a free and easy tilting movement.The inner end of this lever is made V-shaped, as shown at a, and is soadjusted relative to the short arm of the latch-lever as to pass into anotch, or, formed centrally within the beveled edge d of the same, whenthe intermediate lever is moved upward.

G is the hub, journaled at its ends within the side walls of the case,and is provided at its center with a mortise, f, through which theknobspindle passes, in the usual manner. This hub is provided with arms9 g, projecting outward from its periphery, one of which is adjusted tobear against the lower edge of the short arm ot'ythe latchlever, and theother against the lower edge of the intermediate lever, as shown in Fig.1.

The arrangement of the arms gg is such that, as the hub is moved in onedirection by turning the knob, the arm g is elevated so as to lift theshort arm of the latch-lever, thereby moving the latch bolt inward andwhen moved in the opposite direction, the arm 9 is elevated so as tolift the intermediate lever, which, in its turn, lifts the short arm ofthe latch-lever, and which again moves the latch-boltinward; and whenforce is withdrawn from the knob, the spring D forces the latch-leverand latch outward to its normal position when at rest.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is

The combination, with the latch lever F and hub G, provided with thearms gg, of the intermediate lever H, interposed between the short armof the latch-lever and arm g of the hub, substantially as and for thepurpose specified.

WILLIAM A. BARLOW.

Witnesses:

N. G. GRIDLEY, F. A. HERRINGn-

